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Mathematics, 11.06.2021 20:20 maddiehope6893

Michael purchased a prepaid phone card for $50.00. Calls cost 10 cents a minute using this card. The credit, C (in dollars), left on the card after it is used x minutes of calls is given by the following.
C = 50.00 -0.10.x
How much credit is left on the card after Michael uses it for 40 minutes of calls?

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Michael purchased a prepaid phone card for $50.00. Calls cost 10 cents a minute using this card. The...
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